Seven riders qualified from each semi-final and were joined by two nominated wildcards in the decider.
The final took place in Wolverhampton on 15 June 2015 and was won by Woffinden.
It was his third straight success, equalling the feat achieved by Andy Smith between 1993 and 1995.
Craig Cook was second for the second year in a row, earning himself the wildcard place in the 2015 Speedway Grand Prix of Great Britain as a result.
Cook had initially led the final, but Jason Garrity fell and a re-run was then required, which Woffinden won.